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Efter att snckat med några killar som faktiskt kan el/elektronik så verkar det som om konningen är strömreglerande och anpassad efter lampan.. och därmed är det idioti att stoppa in 250W i 600W ballaster.
Så säger även:
http://members.misty.com/don/dschlamp.html#dlhidquote
“Ballasts and Bulbs Should be Matched!
HID bulbs generally need specific ballasts, and any given ballast can usually safely and effectively operate only one type or a few types of HID bulbs.The bulb wattage must be matched to the ballast. A smaller bulb will usually be fed a wattage close to what the proper bulb takes, and will generally overheat and may catastrophically fail. Any catastrophic failures may not necessarily happen quickly. A larger bulb will be underpowered, and will operate at reduced efficiency and may have a shortened lifetime. The ballast may also overheat from prolonged operation with an oversized bulb that fails to warm up. “